Transcript Cancer

Unit 4 --Bellwork #3
• 1. Explain at least two ways in which
mitosis and meiosis are different.
• 2. Why do sperm and egg have only 23
chromosomes?
• 3. The haploid number of a species is 22.
What is its diploid number?
• 4. What are gametes?
• 5. In meiosis, the final result in females is
one _______ and three ____________.
Cell division controls, cancer
and chromosome number
Notes
Cell division controls
• Cells grown in lab will
grow across petri dish
until they touch another
cell or the edges
• Cyclin is a protein that
regulates cell growth
• Other proteins control the
steps of cell cycle thus
control growth
How cancer relates to mitosis
• Cancer is the uncontrolled
division of cells
• Cancerous cells do not respond
to normal growth controls, grow
until all food is gone
• Thought to be caused by
changes in genes controlling
mitosis
• Form masses of tissues called
tumors
• Can be caused by smoking,
pollution, radiation, some viruses
and some are inherited
Compare diploid and haploid
number
• Diploid: cell that contains two
of each kind of chromosome
(2N)
• Body cells are diploid
• Body cells are called Somatic
Cells
• Haploid: cell with only one
kind of chromosome (N)
• Gametes (sex cells) are
haploid
Unit 4 – Quiz #3
1. What is the uncontrolled growth of cells called?
a. cancer
b. cyclin
c. mutation
2. If cells stop growing when the touch other cells
they are ______ cells.
a. cancerous
b. mutated
c. normal
3. Body cells contain 2N number of chromosomes.
They are ?
a. diploid
b. haploid
4. Sex cells contain N number of chromosomes.
They are ?
a. diploid
b. haploid
5. A plant has 40 chromosomes in the body cells.
How many would be in the sex cells?
a. 20
b. 40
c. 80
Part 2 Quiz – Next Class
• Mitosis: identify pictures of each phase,
explain what is happening, name cell cycle
steps in correct order (IPMATC)
• Meiosis: explain what happens, what you
end up with, diploid/haploid
• Cancer: what happens in the cell
• SA#1: Differences between Meiosis &
Mitosis (chart to fill in)
• SA#2: Causes of cancer